Gasolene-engine



A. L. CRAIG.

GASOLENF. ENGINE.

APPLICATION FILED um. I. 1919.

'1 ,360,895. Patented Nov. 30, 1920.

2 SHEETS-SHEET 2- WITNESS: I N VEN TOR.

r T all whom it may concern PATENT OFFICE.

UNITED A STATES- ALBERT n-oimm, or sremrorn, IOWA.

e e Application filedMarch 1,

Be it known that I,',ALBERT L. CRAIG, a. citizen of the United States, residing at Stanhope, in the county of Hamilton and State of Iowa, have invented new and use- Improvements in Gasolene-Engines, of which the following is a specification.

This invention relates to internal combustion engines "of the two-cycle type, one of properJ the-main objects of the invention being to do away with crank case compression-and employ inlieu thereof novel and reliable means of a simple character by which full compression of the explosive mixture is brought about by thepiston within the cylinder Another object in view is to eliminate as 'many working parts as possible, thus reduc 'ing thecost of of the engine and further adding to the re- 7 portion 2 of the bore next to the crank shaft combustion chamber,

- Arranged within the e by providing the same cylinder.

being of greater diameter that the remaining portion 3 of the bore which latter forms the This arrangement provides an internal annular compression shoulder or wall 4 in the cylinder.

The piston 5 through its external area'fits the inder and has a" relatively narrow enlarged portion 'or compressing flange 6 which works in the larger bore 2 of the The piston carries packing-rings to prevent leakage.

skirt of the piston which is held fixed with a flange 11, clamped between the cylinder base and the crank case. The shell 10 forms the inner 7, 8 and 9 7 wall of the compression chamber' 12, the lat- An intake 13 1: supply such asa carbureter has branches 14 and 15 leading to the opposite ends of the Y the compression flan operated at'the proper lows The of mixture GASOLENE-ENGINE.

Specification of Letters Patent.

1919. Serial No. 279,928.

compression chamber 12, and said branches Patented Nov. 30, 1920.:

are controlled by inwardly opening'check valves16 and 17.

The cylinder wall is formed pass 18 of sufficient length to extend around to the inner side of said flange. The inner terminus of the by-pass 18 is over v ge6., a

A main by-pass 19 leads from the inner end of the compression chamber 12 to the comthe cylinder and is a positively opened valve 21 time'by a cam on the run by controlled by crank sha-ft. The exhaust valve 22 is located in'the cy inder head and positively operated by the well known push rod, rod androcker arm means shown. The cylinder head has a hole 3 to receive a spark plug. The piston is coupled to its connecting 'rod' 24 by a ball and socket joint 25, the latter being connected-to the body of-the piston by a spider or arms '26 tween which are intervening spaces 27.

The operation of the engine is as folplosive mixture into the compression chamber 12 through the intake branch 14. In the return stroke of the piston such mixture is compressed against the shoulder 4. Durin th s stroke a fresh supply of explosive mix- I y-pass 18 and the compressed m1xture trapped between the flange 6 and shoulder 4 escapes through the by-pass 18 and enters the compression chamber on the opposite side of the flange 6 permitting it and any further supply of fuel c arge. I

During the next working stroke of the piston the combined mixture is compressed 19 and at the is positively opened der having the crank shank end portion of itsbore enlarged to form a suctionand com- 35 an intake from a source permitting the compressed charge to rush into the combustion chamber 20, forcing the burned gas past the exhaust valve 22 which is positively openedat such time. Ignition occurs when the piston is approximately at the outer limit of its travel, in the position shown in Fig. '1.

v.Tlie operation scribed is then repeated.

I claim:

1.23; two cycle engine, comprising av cylinder having the crank shank end-portion just deof it's bore enlarged to form .a suction'and compression chamber, a piston fitting the smaller. bore ofthe cylinder and having a the larger borecompressing flange fitting of the cylinder, a stationary compress on shellfitting against the inner wall oi the piston and forming the inner wallof'said icompression chamber,

an intake from a source of 'fuel mixture supply leading to the opposite ends of the compressionichamber,'means for establishing and conducting thefinitially compressed fuel mixture in the I compression chamber from one side of the compression flange ,to the other in said chamber for combining with a f-reslr fuel mixture suppl for recompression,

and means for con noting the full compresesd charge of said'fuel mixture from'said compression chamber tothe combustion chamber of the cylinder.

2;, A two cycle engine, comprising, a cylinpression chamber,

of fuel mixture supply leading to the oppo the inner wall of the piston and forming the inner wall ofsaid' compression chamber, and

means for conducting compressed charges flange to the other, 7

from said compression chamberjto the' combustion chamber otthecylinder;

3. A two cycle engine, comprisinga cyl inder having thecrank jshank v end portion of its bore enlarged compression chamber, source of fuel mixture supply leading, to the opposite a piston inder and having a compressing flange ht ting the larger bore of the cylinder,

one side of said compressingflangefto, the other, which by-pass is,overr i"nby said flange, a stationary compression-shell fitting ends of the compression, chamber, fittingthe smaller, bore, ofthe. cyl-V a, bypass; for conducting compressed fluidfifr'omf to .form a suctionand an intake from 'a against the inner; wall ofthe, piston-fand forming the inner lower end of said COIIIPI'BSSlOIL chamber to the combustion chamberaof the cylinder.

wall of said compression chamber, and a valve controlled by-pass for conducting compressed; charges from 1 the In testimony whereof I aflix my signature'. .7

ALBERT Li, CRAIG-.. 

